Electrical Engineering

104VAC is the highest voltage less than 115VAC minus 10%, which is 104.5VAC. 127VAC is the lowest voltage greater than 115VAC plus 10%, which is 126.5VAC. Plus or minus 10% is considered to be the design basis range of standard 115VAC equipment, in order to maintain correct operation.

A closed circuit is one where the current is flowing continuously from the source to the load and back to the source, completing a loop. An open circuit, on the other hand, is one where the current cannot flow because the circuit is broken at some point.

In a three phase that means there are three lines live. Lets name the first line L1, second one L2 and the last L3. If you would connet it to a three phase motor then you require L1, L2 and L3 to be connected either in star or delta connection. Rating of your motor should be 200V, 3 phase , x HP ( star or delta connected). If you have a single motor of 200V then you only need to connect two lines of the three., namely either L1 to L2 , L1 to L3 or L2 to L3.

when electrons flow under AC they flow in both direction firstly forward then in reverse and it does this for as long as there is a potential difference applied to the circuit. under DC the current only flows in one direction only

You would have to rewind the motor (take it apart and remove all the wire wound around the stator and rewind with another diameter wire and another number of turns).
This is not something you want to do at home! but in big expensive machinery it IS done if equipment is transferred to a location with other power sources

Do we harness electricity from lightning? No. It's a lot of electricity at one time, and it's too unpredictable to be cost effective to develop a means of harnessing it's power. Lightning rods simply transfer the electricity into the ground, so as to protect structures.

To calculate the amperage per phase, you can use the formula: Current (A) = Power (W) / (Square Root(3) x Voltage (V)). In this case, for a 45 kW unit at 380 volts, the amperage per phase would be approximately 70 amps.

There is no fixed limit on the number of start and stop operations for an induction motor. However, frequent start and stop operations can lead to increased wear and tear on the motor, affecting its lifespan. It is advisable to minimize frequent start and stop operations to prolong the motor's longevity.

short circuit and fault current are not related or comparable practically or mathematically. a short circuit is a break down in insulation causing contact between live/line conductors. fault current is different. it is measured in the value kA and is the benchmark as to whether your overcurrent device is adequate. this is determined by measurement or enquiry to the local provider.ohms law applies- I=V divided by R.

Capacitive loads have a leading power factor. Current leads voltage when there is capacitive reactance. (The opposite is inductive, which is lagging.)

To calculate the total power in watts used by a service panel with three-phase power, you would multiply the average current for each phase by the voltage and by the square root of 3 (√3 or approximately 1.73). This accounts for the fact that power in a three-phase system involves the line-to-line voltage and the square root of 3 relationship. So, the formula for total power (in watts) would be P = (Iavg x V x √3).

AC generators are commonly used to convert mechanical energy into electrical energy for powering various devices and appliances. They are utilized in power plants to produce electricity on a large scale for residential, commercial, and industrial applications. AC generators are also found in portable generators, wind turbines, and some types of vehicles for generating electricity.

1. Voltmeter has high impedance and hence will restrict the current severely.
a) Electric Bulb will not glow
b) The Ammeter will just measure the current that Voltmeter allows and since this current is much smaller than actual current nothing will happen to ammeter.
c) The Voltmeter will measure the Voltage that is being applied.
d) This will allow you to measure the resistance of the Voltmeter.

VR=V/I

The formula you are looking for is I = W/E.

yes you can.

for example in a 380V 3 wire system the 4th wire or neutral gives 220 volts against each of the 3 phases so you can have 3phase 380 volt plugs as well as 220 V single phase plugs.

ah and by the way you can have as many 3 phase plugs as you like or as the power supply can support ampere wise.

You cannot run a three phase motor on single phase power. You'll burn the motor up within minutes. By the way, I've never seen or heard of a 380 volt motor. Do you mean a 480 volt motor? If so, the only way you can power it is with the correct full voltage and a 3 phase power supply.

The amperage rating of the transformer in a 12V power supply cannot be changed. The size of the copper windings determine the power load (amps) it can handle and the point where the lead is tapped off of the windings determine the voltage. The only way to increase the amperage would be to tap closer to the core which would lower the voltage.
If you need more amps you have to have a heavier transformer.

No, a quadrillion transistors is not approximately the same as the number of neurons in the human brain, because the neurons can make multiple connections to other neurons. Also, it is more than just a "number of bits" in the brain - it is chemistry, meaning that it is more analog than digital - and it is (in some schools of thought) spiritual and/or quantum or sub atomic.

A gantry mechanism in an electric arc furnace is a movable structure that supports and moves the electrode arms over the furnace. It is responsible for controlling the positioning of the electrodes during the melting process, allowing for precise control over the arc length and power input to the furnace. This mechanism enables efficient melting of metal scrap and ensures uniform heating of the materials in the furnace.

The Krebs Cycle is the citric acid cycle. It is used in all aerobic organisms and is one of eight reactions that happen in the mitochondria.

If you connect a 100 ohm resistor across 120 volts it will draw 1.2 amps, amps = E/R. Power = volts x amps so the power required for the resistor would be 120 x 1.2 = 144 watts.

It would not matter if the 120 volt circuit already has 2 amps load on it by something else to calculate the wattage of the resistor.

The total power on this circuit would be the 144 watts from the resistor and 240 watts from the other 2 amp load (2a x 120v) for a total of 384 watts.

A transmission transformer steps the voltage up to a very high value so electricity can travel long distances on transmission lines from the power plant to a city or area with low loss.

A distribution transformer steps the high voltage back down to a level that can be used for local distribution and use by businesses and homes.

You can have only one current carrying conductor in a conduit, but that conduit must have a slot to relieve the eddy currents that will be created by the transformer effect created by the conductor. It is better to run the neutral or opposite conductor along with the hot conductor together in the same conduit, or through the same penetration, so as to minimize this effect.